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研究报告

Comparative analysis of sea fog water chemical composition in the coastal area of Donghai Island

基金项目：国家自然科学基金(No.41505121,41275151,41375138);湖北省气象局科技发展基金(No.2014Y05,2014Z03)

摘要：利用2010年和2011年在广东省湛江市东海岛海雾外场观测试验中获得的雾水样本和雾滴谱资料,对南海沿岸海雾化学特性进行研究.结果表明:2010年雾水的pH和电导率(EC)平均值分别为5.20和1884μS·cm^-1,2011年的pH和EC平均值分别为3.34和505μS·cm^-1.2011年雾水酸性变强的原因主要考虑到酸性物质比重增加.海洋源离子Cl^-和Na⁺的离子浓度很高;SO₄^2-和NO₃^-具有同源性,人为污染的贡献明显.2010和2011年总离子浓度(TIC)的平均值分别为38260μeq·L^-1和5600μeq·L^-1,而实际大气中离子负荷量相差不大,主要是由于2011年观测地点海拔高度的升高会降低湍流因子的影响,减少粒径较大雾滴的沉降,从而促使液态水含量增加,在大气中污染物质浓度变化不大的情况下,离子浓度下降.

Abstract：Based on the data from comprehensive sea fog field observation conducted at the east coast of Donghai Island in Zhanjiang, Guangdong province of China in 2010 and 2011, the data of fog water and fog droplets spectrum were obtained. The average pH and electrical conductivity (EC) value in 2010 was 5.20 and 1884 μS·cm^-1, while the average values of pH and EC in 2011 were 3.34 and 505 μS·cm^-1, respectively. The fog water became more acidic in 2011 caused by the increase of ratio between acidic and alkaline matters. Cl^- and Na⁺ mainly were originated from oceanic aerosols. NO₃^- and SO₄^2- could be influenced by the same source, such as anthropogenic pollutions. The average total ion concentration in 2010 and 2011 were 38260 μeq·L^-1 and 5600 μeq·L^-1, respectively, but the ion loadings were almost in the same magnitude. When the pollutant substances emission changed little, the decline of TIC was owing to the growth of liquid water content caused by the decline of turbulence effect with the rise of altitude.